/Engine/Source/Runtime/Engine/Public/Net/OnlineEngineInterface.h
Mute a remote user for a given local player
virtual bool MuteRemoteTalker ( [UWorld](API\Runtime\Engine\Engine\UWorld) * World, uint8 LocalUserNum, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & PlayerId, bool bIsSystemWide )